SharpPlot Licence Summary

You need to buy one copy of SharpPlot for each developer who will be using it. Deployment is unrestricted and royalty-free, in particular:

Copy and usage restrictions

This license agreement allows you to make unlimited copies of the SharpPlot dll, and to use it on any computer used for development work. However you must buy a licence for every developer who will use SharpPlot.
Deployment of SharpPlot as part of an application over a network or on a server is not restricted in any way, as long as your application is not simply a trivial wrapper around the SharpPlot functionality. In other words, your application must add significant functionality and not provide direct access to the SharpPlot API.